首先纠正一下,is后面的动词没有说过一定要用ING形式
通过分析句子的成分,我们可以看出is 后面是表语,可以作表语的有不定式喝动名词,它们的区别是：
不定式做表语表示主语的具体内容或动作
动名词做表语表示抽象概念.
这句句子后的SKIM OVER THE CHAPTER 是具体动作,所以用不定式
The wisest thing to prepare readingis is to skim over the ch
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